backend_sources += files(
  'backup_manifest.c',
  'basebackup.c',
  'basebackup_copy.c',
  'basebackup_gzip.c',
  'basebackup_lz4.c',
  'basebackup_progress.c',
  'basebackup_server.c',
  'basebackup_sink.c',
  'basebackup_target.c',
  'basebackup_throttle.c',
  'basebackup_zstd.c',
)